# What is the difference between Resistance and Resistivity?

What is the difference between Resistance and Resistivity? As a physics student, you probably must have come across these two terms. Are they one and the same thing? Read on to find out if there exists any difference between them.

## Resistance and Resistivity

Resistance and resistivity are related to each other but they are not the same thing.

**Resistance** is the measure of the opposition to the flow of current through a conductor. It is measured in ohms (Ω) and depends on the material, its length, cross-sectional area, and temperature. The resistance of a material is proportional to its length and inversely proportional to its cross-sectional area. The longer the material, the greater the resistance, and the larger the cross-sectional area, the lower the resistance.

On the other hand, **Resistivity** is a measure of the material’s intrinsic property to resist the flow of current through it. It is the resistance of a material of unit length and unit cross-sectional area. Resistivity is measured in ohm-meters (Ω·m) and depends only on the material and temperature. Resistivity is a fundamental property of a material, and it is used to calculate the resistance of a conductor of a particular size and shape.

In summary, resistance is a property of a conductor, while resistivity is a property of a material. Resistance depends on the dimensions of the conductor, while resistivity depends on the material properties.

## Their key differences

Resistance | Resistivity |

The electrical resistance of an object is a measure of its opposition to the flow of electric current. | Resistivity is the characteristic property of the material by which it resists the amount of current through it. |

It depends upon thelength,area of cross-sectionand nature of the material of the given material,and physical conditions like temperature | It only depends upon thenature of the materialand physical conditions like temperature. |

Its SI unit is the ohm (Ω) | Its SI unit is an ohm meter. (Ω-m) |

It is denoted by R. | It is denoted by ρ (rho) |

The formula for Resistance isR = V/I,or R = ρ(L/A)where V = Voltage, I = Current, ρ = Resistivity | The formula for Resistivity is ρ = (R×A)/Lwhere R = Resistance, L= Length, A = Cross-sectional area |

Resistance depends on the dimensions of the material, like length, area of cross-section | Resistivity is independent of the dimensions of material |